Solving Equations as Balancing Scales
Part 1: Write the equation that pertains to the scale pictured, and then remove
marbles (from both sides to keep it balanced) until you figure out what’s in the
mystery box (the variable).
Example:
B
equation:
=
B+3
6
-3
marbles removed:
what’s in the box:
-3
B
1.
=
3
2.
X
C
=
=
3.
4.
M
Y
=
=
5.
6.
P
S
=
=
Part 2: From the equation, draw the scale. Then, use the scale to solve the
equation.
7.
8.
X+4
=
7
9.
=
8
L+5
10.
Q+1
=
2
11.
9
=
K+6
U+4
=
8
12.
3
=
X+3